This volume includes 35 texts by the Viennese philosopher and philosophy of science theorist Friedrich G. Wallner from the 1980s. All of them engage with the linguistic philosophical thinking of early and late Wittgenstein. The engagement occurs in two ways: In the first part, the texts and fundamental ideas of Wittgenstein are analyzed, clarified, and their influences and impacts are highlighted. The approach of his thinking and its significance for the philosophy of science and poetry are discussed. In the second part, the texts aim to develop a concept of philosophy that understands philosophy as therapy, following Wittgenstein. This concept is applied multiple times within the context of individual sciences.